<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
      /*标签选择器*/
      li{
        color: firebrick;
      }
      /*id指定*/
      #sp02{
        color: yellow;
      }
      /*类选择器*/
      .box{
        color: yellow;
        background: #5f2dab;
        font-size: 23px;
        height: 100px;
        width: 200px;
      }
    </style>
</head>
<body>
  <div class="box">
    <ul>
      <li>565</li>
      <li>cvxcvxcv</li>
      <li>xcvxcv</li>
      <li>xcvxcv</li>
      <li>bvcbc</li>
    </ul>

    <span id="sp02"></span>
  </div>
  <hr>
  <div class="box"></div>
</body>
</html>